What makes it Mighty?
- Converts traditional mason jar into a simple cold brew coffee system
- Secondary Cotton filter is endlessly reusable and machine washable
- Lid and filter made from food grade silicone and 304 stainless steel
Rumble Jar is a next-generation cold brew coffee maker, designed to work in tandem with the classic Mason jar. This 4-piece brew kit is all the equipment you need to make professional-quality cold brew coffee right at home. Just add coffee and water and give it a rumble. Prep time takes less than one minute, and by the morning you'll have delicious cold brew coffee ready to drink.
Each kit includes:
- 32oz Wide-Mouth Mason Jar (traditional)
- Stainless Steel Cold Brew Filter
- Food-Grade Silicone Cap
- Cotton Sock (optional 2nd stage filter)
The Filter—Specifically engineered for cold brew coffee, this is not your run-of-the-mill mesh filter. We built our filter from the ground-up using etched stainless steel construction that's lightweight but shockingly sturdy. The 200 micron holes allow water to circulate at a rate that's ideal for making barista-quality cold brew.
The Cap—Rumble Jar's secret sauce. Our patent-pending cap design allows the filter to be fully-nested inside the Mason jar, without interfering with the Mason jar's natural seal. As a result, your coffee stays both leakproof and airtight.
The Mason Jar—An ideal brewing + drinking + storage vessel with a legendary seal. Our patent-pending design keeps the seal intact, allowing your coffee to stay fresher since the jar remains airtight and more resistant to oxidation (aka the "coffee killer"). A good seal also keeps it from leaking all over your hands and kitchen.
About Rumble Jar
We make it easy for families to create a healthy home. Each of our 1000+ products has been thoroughly researched to be free of concerning chemicals, and hand-picked for its quality and design. With products for the whole family, ranging from kitchenware to reusable lunch gear to skincare, it is truly better living made easy.